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            <h2 class="title"><a id="txnapp"></a>Chapter 2. Transactional Application</h2>
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          <b>Table of Contents</b>
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          <dt>
            <span class="sect1">
              <a href="txnapp.html#appoverview">Application Overview</a>
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              <a href="simpleprogramlisting.html">Program Listing</a>
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              <dt>
                <span class="sect2">
                  <a href="simpleprogramlisting.html#repconfiginfo_cxx">
                            
                            <span>Class: RepConfig</span>
                    </a>
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              <dt>
                <span class="sect2">
                  <a href="simpleprogramlisting.html#simpletxnusage_java">Class: SimpleTxn</a>
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              <dt>
                <span class="sect2">
                  <a href="simpleprogramlisting.html#simpletxnmain_java">Method: SimpleTxn.main()</a>
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              <dt>
                <span class="sect2">
                  <a href="simpleprogramlisting.html#simpletxn_init_java">Method: SimpleTxn.init()</a>
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              <dt>
                <span class="sect2">
                  <a href="simpleprogramlisting.html#doloop_java">Method: SimpleTxn.doloop()</a>
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              <dt>
                <span class="sect2">
                  <a href="simpleprogramlisting.html#printstocks_c">
                            
                            
                            <span>Method: SimpleTxn.printStocks()</span>
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      <p>
        In this chapter, we build a simple transaction-protected DB
        application. Throughout the remainder of this book, we will add
        replication to this example. We do this to underscore the concepts
        that we are presenting in this book; the first being that you
        should start with a working transactional program and then add
        replication to it.
    </p>
      <p>
        Note that this book assumes you already know how to write a
        transaction-protected DB application, so we will not be
        covering those concepts in this book. To learn how to write a
        transaction-protected application, see the 
        <em class="citetitle">Berkeley DB Getting Started with Transaction Processing</em> guide.
    </p>
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              <h2 class="title" style="clear: both"><a id="appoverview"></a>Application Overview</h2>
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        <p>
                Our application maintains a stock market quotes database.
                This database contains records whose key is the stock
                market symbol and whose data is the stock's price.
            </p>
        <p>
                The application operates by presenting you with a command
                line prompt. You then enter the stock symbol and its value,
                separated by a space. The application takes this
                information and writes it to the database. 
            </p>
        <p>
                    To see the contents of the database, simply press
                    <code class="literal">return</code> at the command prompt.
            </p>
        <p>
                To quit the application, type 'quit' or 'exit' at the
                command prompt.
            </p>
        <p>
                For example, the following illustrates the application's
                usage. In it, we use entirely fictitious stock market
                symbols and price values.
            </p>
        <pre class="programlisting">&gt; java db.repquote_gsg.SimpleTxn -h env_home_dir
QUOTESERVER&gt; stock1 88
QUOTESERVER&gt; stock2 .08
QUOTESERVER&gt; 
        Symbol  Price
        ======  =====
        stock1  88

QUOTESERVER&gt; stock1 88.9
QUOTESERVER&gt; 
        Symbol  Price
        ======  =====
        stock1  88.9
        stock2  .08

QUOTESERVER&gt; quit 
&gt;</pre>
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